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CVE-2026-16380: Firefox Networking Component Can Be Bypassed

CVE-2026-16380 CVE-2026-16380

Summary

The Firefox Networking component has a vulnerability that could allow attackers to bypass security protections. This issue affects Firefox users, and it's been fixed in version 153. To stay secure, ensure you're running the latest version of Firefox.

What to do

No fix is available yet. Check with your software vendor for updates.

Affected software

Vendor	Product	Affected versions
mozilla	firefox	All versions

Original title

Mitigation bypass in the Networking component

Original description

Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 153.

Vulnerability type

CWE-693 Protection Mechanism Failure

https://bugzilla.mozilla.org/show_bug.cgi?id=2040386
https://www.mozilla.org/security/advisories/mfsa2026-68/

Published: 21 Jul 2026 · Updated: 23 Jul 2026 · First seen: 21 Jul 2026